#include<fstream>
using namespace std;

int main()
{
	ifstream in;
	ofstream out;

	char a, b;
	unsigned long long int nl=0, nc=0;

	in.open("text.in");
	out.open("text.out");
	in >> b;
	if ((b >= 'a' && b <= 'z') || (b >= 'A' && b <= 'Z'))
	{
		nl++;
	}
	while (!in.eof())
	{
		in.get(a);
		if ((a >= 'a' && a <= 'z') || (a >= 'A' && a <= 'Z'))
		{
			nl++;
		}
		else
		{
			if ((b >= 'a' && b <= 'z') || (b >= 'A' &&b <= 'Z') )
			{
				nc++;
			}
		}
		
		b = a;
	}

	out << nl / nc;
}